STL-style allocator wrapper for ArenaHeapAllocator. More...

#include <ArenaHeapSTLAllocator.h>

Collaboration diagram for SG::ArenaHeapSTLAllocator< T, VETO >:

Classes
struct	rebind
	Standard STL allocator rebinder. More...

Public Types
typedef T *	pointer
	Standard STL allocator typedefs. More...

typedef const T *	const_pointer

typedef T &	reference

typedef const T &	const_reference

typedef T	value_type

typedef size_t	size_type

typedef ptrdiff_t	difference_type

typedef std::false_type	propagate_on_container_copy_assignment
	When we assign to a container, the target should retain its allocator. More...

typedef std::true_type	propagate_on_container_move_assignment
	Move allocators on move/swap. More...

typedef std::true_type	propagate_on_container_swap

Public Member Functions
	ArenaHeapSTLAllocator (size_t nblock=1000, const std::string &name="")
	Default constructor. More...

	ArenaHeapSTLAllocator (const ArenaHeapSTLAllocator &a)
	Copy constructor. More...

template<class U , class V >
	ArenaHeapSTLAllocator (const ArenaHeapSTLAllocator< U, V > &a)
	Constructor from another `ArenaHeapSTLAllocator`. More...

	ArenaHeapSTLAllocator (ArenaHeapSTLAllocator &&a)
	Move constructor. More...

ArenaHeapSTLAllocator &	operator= (ArenaHeapSTLAllocator &&a)
	Move assignment. More...

void	swap (ArenaHeapSTLAllocator &a)
	Swap. More...

ArenaHeapSTLAllocator	select_on_container_copy_construction () const
	Return allocator to use for a copy-constructed container. More...

bool	operator== (const ArenaHeapSTLAllocator &other) const
	Equality test. More...

bool	operator!= (const ArenaHeapSTLAllocator &other) const
	Inequality test. More...

pointer	address (reference x) const
	Convert a reference to an address. More...

	ATH_MEMBER_REQUIRES (!(std::is_same_v< reference, const_reference >), const_pointer) address(const_reference x) const

pointer	allocate (size_type n, const void *hint=0)
	Allocate new objects. More...

void	deallocate (pointer, size_type n)
	Deallocate objects. More...

	deallocate (const_pointer p, size_type n) const

size_type	max_size () const throw ()
	Return the maximum number of objects we can allocate at once. More...

template<class... Args>
void	construct (pointer p, Args &&... args)
	Call the `T` constructor. More...

void	destroy (pointer p)
	Call the `T` destructor. More...

size_t	nblock () const
	Return the hinted number of objects allocated per block. More...

const std::string &	name () const
	Return the name of this allocator. More...

void	reset ()
	Free all allocated elements. More...

void	erase ()
	Free all allocated elements and release memory back to the system. More...

void	reserve (size_t size)
	Set the total number of elements cached by the allocator. More...

ArenaAllocatorBase::Stats	stats () const
	Return the statistics block for this allocator. More...

const ArenaBlockAllocatorBase *	poolptr () const
	Return a pointer to the underlying allocator (may be 0). More...

void	protect ()
	Write-protect the memory managed by this allocator. More...

void	unprotect ()
	Write-enable the memory managed by this allocator. More...

Private Attributes
ArenaHeapAllocator	m_pool
	The underlying allocator. More...

Detailed Description

template<class T, class VETO = T>
class SG::ArenaHeapSTLAllocator< T, VETO >

STL-style allocator wrapper for ArenaHeapAllocator.

This is the generic specialization, which uses the heap allocator.

See the file-level comments for details.

Definition at line 94 of file ArenaHeapSTLAllocator.h.

Member Typedef Documentation

◆ const_pointer

template<class T , class VETO = T>

typedef const T* SG::ArenaHeapSTLAllocator< T, VETO >::const_pointer

Definition at line 99 of file ArenaHeapSTLAllocator.h.

◆ const_reference

template<class T , class VETO = T>

typedef const T& SG::ArenaHeapSTLAllocator< T, VETO >::const_reference

Definition at line 101 of file ArenaHeapSTLAllocator.h.

◆ difference_type

template<class T , class VETO = T>

typedef ptrdiff_t SG::ArenaHeapSTLAllocator< T, VETO >::difference_type

Definition at line 104 of file ArenaHeapSTLAllocator.h.

◆ pointer

template<class T , class VETO = T>

typedef T* SG::ArenaHeapSTLAllocator< T, VETO >::pointer

Standard STL allocator typedefs.

Definition at line 98 of file ArenaHeapSTLAllocator.h.

◆ propagate_on_container_copy_assignment

template<class T , class VETO = T>

typedef std::false_type SG::ArenaHeapSTLAllocator< T, VETO >::propagate_on_container_copy_assignment

When we assign to a container, the target should retain its allocator.

Definition at line 107 of file ArenaHeapSTLAllocator.h.

◆ propagate_on_container_move_assignment

template<class T , class VETO = T>

typedef std::true_type SG::ArenaHeapSTLAllocator< T, VETO >::propagate_on_container_move_assignment

Move allocators on move/swap.

Definition at line 110 of file ArenaHeapSTLAllocator.h.

◆ propagate_on_container_swap

template<class T , class VETO = T>

typedef std::true_type SG::ArenaHeapSTLAllocator< T, VETO >::propagate_on_container_swap

Definition at line 111 of file ArenaHeapSTLAllocator.h.

◆ reference

template<class T , class VETO = T>

typedef T& SG::ArenaHeapSTLAllocator< T, VETO >::reference

Definition at line 100 of file ArenaHeapSTLAllocator.h.

◆ size_type

template<class T , class VETO = T>

typedef size_t SG::ArenaHeapSTLAllocator< T, VETO >::size_type

Definition at line 103 of file ArenaHeapSTLAllocator.h.

◆ value_type

template<class T , class VETO = T>

typedef T SG::ArenaHeapSTLAllocator< T, VETO >::value_type

Definition at line 102 of file ArenaHeapSTLAllocator.h.

Constructor & Destructor Documentation

◆ ArenaHeapSTLAllocator() [1/4]

template<class T , class VETO = T>

SG::ArenaHeapSTLAllocator< T, VETO >::ArenaHeapSTLAllocator	(	size_t	nblock = `1000`,
		const std::string &	name = `""`
	)

Default constructor.

Parameters

nblock	Value to set in the parameters structure for the number of elements to allocate per block.
name	Value to set in the parameters structure for the allocator name.

◆ ArenaHeapSTLAllocator() [2/4]

template<class T , class VETO = T>

SG::ArenaHeapSTLAllocator< T, VETO >::ArenaHeapSTLAllocator ( const ArenaHeapSTLAllocator< T, VETO > & a )

Copy constructor.

The name and nblock parameters are copied, but the data are not.

◆ ArenaHeapSTLAllocator() [3/4]

template<class T , class VETO = T>

template<class U , class V >

SG::ArenaHeapSTLAllocator< T, VETO >::ArenaHeapSTLAllocator ( const ArenaHeapSTLAllocator< U, V > & a )

Constructor from another ArenaHeapSTLAllocator.

The name and nblock parameters are copied, but the data are not.

◆ ArenaHeapSTLAllocator() [4/4]

template<class T , class VETO = T>

SG::ArenaHeapSTLAllocator< T, VETO >::ArenaHeapSTLAllocator ( ArenaHeapSTLAllocator< T, VETO > && a )

Move constructor.

Move the data.

Member Function Documentation

◆ address()

template<class T , class VETO = T>

pointer SG::ArenaHeapSTLAllocator< T, VETO >::address ( reference x ) const

Convert a reference to an address.

◆ allocate()

template<class T , class VETO = T>

pointer SG::ArenaHeapSTLAllocator< T, VETO >::allocate	(	size_type	n,
		const void *	hint = `0`
	)

Allocate new objects.

Parameters

n	Number of objects to allocate. Must be 1.
hint	Allocation hint. Not used.

◆ ATH_MEMBER_REQUIRES()

template<class T , class VETO = T>

SG::ArenaHeapSTLAllocator< T, VETO >::ATH_MEMBER_REQUIRES	(	!	std::is_same_v< reference, const_reference >,
		const_pointer
	)		const

inline

Definition at line 204 of file ArenaHeapSTLAllocator.h.

206 { return &x; }

◆ construct()

template<class T , class VETO = T>

template<class... Args>

void SG::ArenaHeapSTLAllocator< T, VETO >::construct	(	pointer	p,
		Args &&...	args
	)

Call the T constructor.

Parameters

p	Location of the memory.
args	Arguments to pass to the constructor.

◆ deallocate() [1/2]

template<class T , class VETO = T>

SG::ArenaHeapSTLAllocator< T, VETO >::deallocate	(	const_pointer	p,
		size_type	n
	)		const

inline

Definition at line 223 of file ArenaHeapSTLAllocator.h.

   {
     pointer p_nc ATLAS_THREAD_SAFE = const_cast<pointer>(p);
     deallocate (p_nc, n);
   }

◆ deallocate() [2/2]

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::deallocate	(	pointer	,
		size_type	n
	)

Deallocate objects.

Parameters

n	Number of objects to deallocate. Must be 1.

◆ destroy()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::destroy ( pointer p )

Call the T destructor.

Parameters

p	Location of the memory.

◆ erase()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::erase ( )

Free all allocated elements and release memory back to the system.

All elements allocated are freed, and all allocated blocks of memory are released back to the system. destructor should be called on them if it was provided (preceded by clear if provided and mustClear was set).

◆ max_size()

template<class T , class VETO = T>

size_type SG::ArenaHeapSTLAllocator< T, VETO >::max_size	(	)	const
throw	(
	)

Return the maximum number of objects we can allocate at once.

This always returns 1.

◆ name()

template<class T , class VETO = T>

const std::string& SG::ArenaHeapSTLAllocator< T, VETO >::name ( ) const

Return the name of this allocator.

◆ nblock()

template<class T , class VETO = T>

size_t SG::ArenaHeapSTLAllocator< T, VETO >::nblock ( ) const

Return the hinted number of objects allocated per block.

◆ operator!=()

template<class T , class VETO = T>

bool SG::ArenaHeapSTLAllocator< T, VETO >::operator!= ( const ArenaHeapSTLAllocator< T, VETO > & other ) const

Inequality test.

Two allocators should compare equal if objects allocated by one can be deallocated by the other. We should just check if they are the same object.

◆ operator=()

template<class T , class VETO = T>

ArenaHeapSTLAllocator& SG::ArenaHeapSTLAllocator< T, VETO >::operator= ( ArenaHeapSTLAllocator< T, VETO > && a )

Move assignment.

Move the data.

◆ operator==()

template<class T , class VETO = T>

bool SG::ArenaHeapSTLAllocator< T, VETO >::operator== ( const ArenaHeapSTLAllocator< T, VETO > & other ) const

Equality test.

Two allocators should compare equal if objects allocated by one can be deallocated by the other. We should just check if they are the same object.

◆ poolptr()

template<class T , class VETO = T>

const ArenaBlockAllocatorBase* SG::ArenaHeapSTLAllocator< T, VETO >::poolptr ( ) const

Return a pointer to the underlying allocator (may be 0).

◆ protect()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::protect ( )

Write-protect the memory managed by this allocator.

Adjust protection on the memory managed by this allocator to disallow writes.

◆ reserve()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::reserve ( size_t size )

Set the total number of elements cached by the allocator.

Parameters

size	The desired pool size.

This allows changing the number of elements that are currently free but cached. Any allocated elements are not affected by this call.

If size is greater than the total number of elements currently cached, then more will be allocated. This will preferably done with a single block, but that is not guaranteed; in addition, the allocator may allocate more elements than is requested.

If size is smaller than the total number of elements currently cached, as many blocks as possible will be released back to the system. It may not be possible to release the number of elements requested; this should be implemented on a best-effort basis.

◆ reset()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::reset ( )

Free all allocated elements.

All elements allocated are returned to the free state. clear should be called on them if it was provided. The elements may continue to be cached internally, without returning to the system.

◆ select_on_container_copy_construction()

template<class T , class VETO = T>

ArenaHeapSTLAllocator SG::ArenaHeapSTLAllocator< T, VETO >::select_on_container_copy_construction ( ) const

Return allocator to use for a copy-constructed container.

When we copy-construct a container, we want the new allocator to copy parameters from the old one, but not the data.

◆ stats()

template<class T , class VETO = T>

ArenaAllocatorBase::Stats SG::ArenaHeapSTLAllocator< T, VETO >::stats ( ) const

Return the statistics block for this allocator.

◆ swap()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::swap ( ArenaHeapSTLAllocator< T, VETO > & a )

Swap.

◆ unprotect()

template<class T , class VETO = T>

void SG::ArenaHeapSTLAllocator< T, VETO >::unprotect ( )

Write-enable the memory managed by this allocator.

Adjust protection on the memory managed by this allocator to allow writes.

Member Data Documentation

◆ m_pool

template<class T , class VETO = T>

ArenaHeapAllocator SG::ArenaHeapSTLAllocator< T, VETO >::m_pool

private

The underlying allocator.

Definition at line 340 of file ArenaHeapSTLAllocator.h.

The documentation for this class was generated from the following file:

ArenaHeapSTLAllocator.h

Classes

Public Types

Public Member Functions

Private Attributes

Detailed Description

template<class T, class VETO = T> class SG::ArenaHeapSTLAllocator< T, VETO >

Member Typedef Documentation

◆ const_pointer

◆ const_reference

◆ difference_type

◆ pointer

◆ propagate_on_container_copy_assignment

◆ propagate_on_container_move_assignment

◆ propagate_on_container_swap

◆ reference

◆ size_type

◆ value_type

Constructor & Destructor Documentation

◆ ArenaHeapSTLAllocator() [1/4]

◆ ArenaHeapSTLAllocator() [2/4]

◆ ArenaHeapSTLAllocator() [3/4]

◆ ArenaHeapSTLAllocator() [4/4]

Member Function Documentation

◆ address()

◆ allocate()

◆ ATH_MEMBER_REQUIRES()

◆ construct()

◆ deallocate() [1/2]

◆ deallocate() [2/2]

◆ destroy()

◆ erase()

◆ max_size()

◆ name()

◆ nblock()

◆ operator!=()

◆ operator=()

◆ operator==()

◆ poolptr()

◆ protect()

◆ reserve()

◆ reset()

◆ select_on_container_copy_construction()

◆ stats()

◆ swap()

◆ unprotect()

Member Data Documentation

◆ m_pool

template<class T, class VETO = T>
class SG::ArenaHeapSTLAllocator< T, VETO >